application vs diligence

application and diligence both are nouns.

Word	Noun	Adjective	Verb	Adverb
application	Yes	No	No	No
diligence	Yes	No	No	No

As nouns, application and diligence are synonyms defined as:

application (noun)	diligence (noun)
the action of putting something into operation	a diligent effort
a diligent effort	persevering determination to perform a task
the act of bringing something to bear; using it for a particular purpose	conscientiousness in paying proper attention to a task; giving the degree of care required in a given situation
the work of applying something
liquid preparation having a soothing or antiseptic or medicinal action when applied to the skin
a verbal or written request for assistance or employment or admission to a school
a program that gives a computer instructions that provide the user with tools to accomplish a task